Workshop Technology
In a four high rolling mill, there are four rolls out of which

All of the four are working rolls
Three are working rolls and one is backing up roll
One is working roll and three are backing up rolls
Two are working rolls and two are backing up rolls

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Workshop Technology
The purpose of a riser is to

Act as a reservoir for the molten metal
Deliver molten metal into the mould cavity
Deliver the molten metal from pouring basin to gate
Feed the molten metal to the casting in order to compensate for the shrinkage

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